<template>
	<view>
		<!-- 搜索组件 -->
		<my-search :bgcolor="'#eaeaea'" :radius="5" @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<!-- <block v-for="(item, i) in cateList" :key="i"> -->
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">
						{{item.cat_name}}</view>
					<!-- </block> -->
				</block>
			</scroll-view>
			<scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 当前二级分类下的三级分类列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的Item项 -->
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3"
							@click="gotoGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>

			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 当前设备可用的高度
				wh: 0,
				active: 0,
				// 分类列表数据
				cateList: [],
				cateLevel2: [],
				scrollTop:0
			};
		},
		onLoad() {
			// 可以用来获取当前页面可用区域
			const sysInfo = uni.getSystemInfoSync()
			console.log(sysInfo)
			// 可视区域的高度
			this.wh = sysInfo.windowHeight-50
			this.getCateList()
		},
		methods: {
			// 获取分类列表的数据
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message

				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) {
				this.active = i

				// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				// 在切换一级分类的时候，将顶部距离分为1px和0px，1px不出来，但都是在顶部
				this.scrollTop = this.scrollTop === 0 ? 1 : 0

			},
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpackages/good-list/good-list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpackages/search/search'
				})
			}

		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				background-color: #F7F7F7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;

				&.active {
					background-color: #ffffff;
					position: relative;

					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #C00000;
						position: absolute;
						top: 50%;
						left: 0;
						transform: translateY(-50%);
					}
				}
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>